Hey guys, just had a bug submitted for a site I maintain which heavily uses the viewstate (not my code). However on certain pages when the viewstate is extra bloated Safari is throwhing the usual "Validation of viewstate MAC failed" error. Any ideas?? Only happens in Safari, Firefox, IE, Opera all fine....
I have a problem with maintaining state in an ASP.NET AJAX page. Short version: I need some way to update the page ViewState after an async callback has been made, to reflect any state changes the server made during the async call. This seems to be a common problem, but I will describe my scenario to help explain: I have a grid-like c...
I need to see the contents of the viewstate of an asp.net page. I looked for a viewstate decoder, found Fridz Onion's ViewState Decoder but it asks for the url of a page to get its viewstate. Since my viewstate is formed after a postback and comes as a result of an operation in an update panel, I cannot provide a url. I need to copy & pa...
I am trying to set a ViewState-variable when a button is pressed, but it only works the second time i click the button. Here is the codebehind: protected void Page_Load(object sender, EventArgs e) { if (Page.IsPostBack) { lblInfo.InnerText = String.Format("Hello {0} at {1}!", YourName, DateTime.Now.ToLongTimeString()); } } private...
I have a rather complex page that dynamically builds user controls inside of a repeater. This repeater must be bound during the Init page event before ViewState is initialized or the dynamically created user controls will not retain their state. This creates an interesting Catch-22 because the object I bind the repeater to needs to be c...
This has been a fun week (if you look back at my questions you'll see a common theme). I have a repeater that is bound to a collection. Each repeater item dynamic control that corresponds to the collection item, it also renders out a header over each control that contains a Delete link. When the delete link is clicked, the appropriate ...
We are trying to lighten our page load as much as possible. Since ViewState can sometimes swell up to 100k of the page, I'd love to completely eliminate it. I'd love to hear some techniques other people have used to move ViewState to a custom provider. That said, a few caveats: We serve on average 2 Million unique visitors per hour. ...
During a discussion about security, a developer on my team asked if there was a way to tell if viewstate has been tampered with. I'm embarrassed to say that I didnt know the answer. I told him I would find out, but thought I would give someone on here a chance to answer first. I know there is some automatic validation, but is there a way...
I'm running some c# .net pages with various gridviews. If I ever leave any of them alone in a web browser for an extended period of time (usually overnight), I get the following error when I click any element on the page. I'm not really sure where to start dealing with the problem. I don't mind resetting the page if it's viewstate has e...
On my journey into the depths of custom ASP.NET control development I am obviously getting my head around the ASP.NET PostBack model and how it affects control development. I understand that controls have no "lifetime" in ASP.NET, and therefore must be re-initialized on each and every page load. We overcome this by persisting the object...
I know it happens sometime before Load, but during what event exactly? ...
I need to retrieve a record from a database, display it on a web page (I'm using ASP.NET) but store the ID (primary key) from that record somewhere so I can go back to the database later with that ID (perhaps to do an update). I know there are probably a few ways to do this, such as storing the ID in ViewState or a hidden field, but wha...
Here's the situation: I have a label's text set, immediately followed by a response.redirect() call as follows (this is just an example, but I believe it describes my situation accurately): aspx: <asp:Label runat="server" Text="default text" /> Code-behind (code called on an onclick event): Label.Text = "foo"; Response.Redirect("Def...
I am looking for an enhancement to JSON that will also serialize methods. I have an object that acts as a collection of objects, and would like to serialize the methods of the collection object as well. So far I've located ClassyJSON. Any thoughts? ...
What is the best way to reduce the size of the viewstate hidden field in JSF? I have noticed that my view state is approximately 40k this goes down to the client and back to the server on every request and response espically coming to the server this is a significant slowdown for the user. My Environment JSF 1.2, MyFaces, Tomcat, Toma...
We have created a control that needs to persist data via the ViewState property of the Control class. Our class subclasses control strictly to get access to the ViewState property (it's protected on the Page object). We are adding the control to Page.Controls in OnInit, and then attempt to set the ViewState property in OnPreLoad. When w...
I am moving from classic ASP to ASP.NET and have encountered what many of you already know as "viewstate". I might be jumping the gun with my assumption, but it looks highly cumbersome. I have developed many ASP forms in the past and never had issues with keeping state. Is there another way OR am I going to have to learn this Viewstat...
What is the cause of this exception in ASP.NET? Obviously it is a viewstate exception, but I can't reproduce the error on the page that is throwing the exception (a simple two TextBox form with a button and navigation links). FWIW, I'm not running a web farm. Exception Error Message: Unable to validate data. Error Source: S...
I have a internal website that users log into. This data is saved as a cookie. From there the users go on their merry way. Every so often the application(s) will query the authentication record to determine what permissions the user has. My question is this: Is it more efficent to just query the cookie for the user data when it is n...
I am trying to create a custom control that a "gridview" like control but specifcally for business objects that implement certain custom interfaces. In doing this I have come across the following problem. I have a control that I have disabled viewstate on (and I don't want to re-enable it) and it has a child control that I want viewst...